Abstract: A leveling device for recreational vehicles such as campers, trailers and the like, wherein the device is positioned under a wheel of the particular vehicle so as to level the vehicle to a horizontal plane while it is parked. The device is formed having a base structure defining a recess to receive a support-platform structure and a hydraulic jack when the device is in a collapsed storage mode. The base structure includes an inclined ramp whereby the wheel of the vehicle is allowed to be positioned on the support platform, so as to be raised by the jack to the proper height in order to level the vehicle. The device includes a safety locking mechanism whereby the platform is prevented from collapsing if the jack malfunctions.

Abstract: A log splitter wherein a wedge having a cutting edge and a hydraulic power unit are arranged on one and the other ends of an I beam horizontally supported by supports, is disclosed. A log to be split is placed on the I beam between the wedge and the hydraulic power unit and is pushed towards the wedge by a ram of the hydraulic power unit. The hydraulic power unit is actuated by either air pump means or manual pump means, or by both the two means in the same time.

Abstract: A hydraulic jack comprises a base having a vertically disposed cylindrical member attached thereto. A cylindrical movable member is mounted on the fixed member and is vertically movable relative thereto. The base is provided with passages therethrough which are connected in communicating relation to a source of fluid under pressure, such as a reservoir and pump. The fixed and movable members define a pair of variable chambers, each of which is connected in communicating relation with one of the passages by a restricted orifice to reduce the flow of fluid to and from the chambers. When one of the chambers is pressurized, the movable member is raised and will support a load engaged thereby. When the other chamber is pressurized, the movable member is lowered. Fluid in the chambers is prevented from returning to the reservoir by valve elements. A valve actuator is operated by fluid pressure and selectively opens each passage to permit the return of fluid to the reservoir.

Abstract: A log splitter having a manually adjustable wedge and a power driven base for supporting the log and forcing it upwardly into the splitting wedge. The wedge is supported by a carriage that is releasably secured to two standards by a pair of quick-release clamps, operable with one hand. The support includes a central projection extending toward and in alignment with the terminus of the wedge to minimize twisting moments generated by the splitting forces.

Abstract: A combination of a hydraulic jack with a triangulated steel stand interlocked with a novel, key-secured, ribbed cylinder of high strength light weight alloy, thread-connected to the lifting ram of the jack. Fast finder funnels are enjoined for rapid setting and operating of the combination with a handle having a 90.degree. bend at one extremity and a hinged center engaged by a spring released sleeve restrainer.

Abstract: A vertical type log splitter for home use in which a splitting wedge is releasably secured to upright frame members and a power-driven ram guide supports a log to be split and forces it into the splitting wedge. To protect the frame of the log splitter from damage caused by twisting moments and to provide a visual indication of the presence of such moments, the ram guide is tiltably mounted and arranged to abort the splitting action when the angle of tilt exceeds a predetermined angle.

Abstract: A log splitter with automatic overload protection that prevents the log splitter structure from being damaged by accidental overload. A low-mass rapid-response pressure relief valve is incorporated in the pump side of a hydraulic jack, which produces the splitting force, so that the pressure that can be applied to the jack plunger is limited, but the load that can be supported by the jack is not so limited. The hydraulic jack has applications apart from the log splitter.

Abstract: A log splitting apparatus includes a horizontal beam, a hydraulic ram mounted at one end of the beam, and a wedge secured to the other end of the beam. A log placed between the ram and the wedge is split by extending the ram. The wedge is formed by a simple and inexpensive yet sturdy construction which includes a vertical center plate, a pair of wedge plates which are secured to and extend laterally away from the center plate, and gusset plates which extend perpendicularly to the center plate and reinforce the wedge plates. The ram is operable by two operating handles--one for high speed operation and one for high power operation. The handles can be operated separately or simultaneously to provide three operating speeds.

Abstract: The present invention is an improved jack device which comprises mainly a jack body, a plunger pump, a base seat and an oil passage device. The outer cylinder of the jack body is made of transparent, semi-transparent plastic material or the like, cylindrical in shape with calibration marked on its wall for indicating oil level, has a soft tube nozzle insetting its wall with a soft tube attached thereto and disposed in the enclosed space of the outer cylinder and is communicable with plunger pump, thereby enabling the reading of the oil amount and the use of the device in inclined positions. Further, the cylinder of the jack body and the cylinder of the plunger pump are formed with base portions by direct forging, are cylindrical in shape and inserted into the corresponding holes of the base seat, firmly fixed on the base seat by welding, making both of them oil-leak proof.

Abstract: A hydraulic jack includes a fixed, cylindrical member mounted on a base, and a moveable member mounted exteriorly around and shiftable on the fixed member. The interior of the fixed and moveable members defines an expandable and contractable chamber, which, when expanded with hydraulic liquid extends the jack upwardly. The space between the exterior surface of the fixed member and the interior surface of the moveable member defines a second expandable and contractable chamber, which, when expanded with hydraulic liquid retracts the jack downwardly. Adjustable lift elements are mounted on the moveable member and are adapted to engage a device to be elevated.

Abstract: A hydraulic vehicle jack including a novel release valve is disclosed. The jack is of the type having a high pressure cylinder, a ram partially extensible from and retractable into the cylinder, and a high pressure pump for forcing fluid from a reservoir into the cylinder to extend the jack. When it is desired to lower the jack, the release valve needle is turned so as to withdraw a needle tip from fluid-flow-halting engagement with a valve seat. This needle tip is formed in the shape of a cone having an altitude of a dimension greater than the cone base radius. When the needle tip is withdrawn from its position against the valve seat, a small but precisely defined fluid-flow-permitting orifice is created. Valve lowering action then occurs over an extended time period which permits the jack operator to precisely control or halt valve lowering action as desired.

Abstract: A hydraulic jack is disclosed, of the type comprising a ram having a head portion reciprocable in a cylinder between two cylinder ends, and sealing means carried on the ram head portion to provide a substantially fluid-tight seal between the ram and the cylinder interior surface. In this jack, an open sided pressure relief trough is formed in the interior surface of the cylinder adjacent one end to permit the flow of fluid past the sealing means when the head portion is located substantially adjacent the cylinder end and relief trough. Fluid bleeding action past the relief trough thus prevents forcing the ram head and sealing means against the cylinder end. When the jack is so constructed, the sealing means can include an elastomeric seal cup member which will not be damaged by its travel past the trough.

Abstract: A hydraulic jack comprising a cylinder, a piston slidable relative to the cylinder, pump means to supply pressurized fluid to the base of the piston, a seal between the piston and the cylinder, means for limiting the stroke of the piston in the cylinder, said means comprising a ring carried by the piston and arranged to expand into a groove in the cylinder wall when the piston reaches the end of its permitted travel, and means for selectively de-activating said stroke limiting means, in order to allow removal of the piston from the cylinder to renew the seal.

Abstract: Presented is a hydraulic jack structure having a pump assembly in connection with which is rotatably mounted a pump handle assembly which may be rotated in a horizontal plane through about 320.degree. to permit selective positioning of the handle during a pumping operation.

Abstract: This invention relates to a lifting jack device for use with automobiles and the like. The jack includes a chamber for receipt of pressurized air constructed of a generally toroidal shape so as to resemble the configuration of a spare automobile tire. The central interior of the chamber is provided with cylinder and piston means operable by suitable valve means to extend a jack arm portion thereof outwardly and under pressure so as to impart lifting force to objects to be elevated. The entire jacking device is particularly adapted for placement beneath an automobile to lift a wheel thereof as for changing tires. Accordingly, the jack includes a relatively flat base portion and means for controlling the suitable valve mechanisms positioned at peripheral portions of the chamber so as to be readily accessible when the jack is placed in operable position beneath a car body.

Abstract: Presented is a hydraulic jack structure incorporating an actuating assembly which mutiplies the mechanical advantage between the handle and the pump of the hydraulic jack. A power train is provided interposed between the handle assembly and the pump assembly, increasing the mechanical advantage between the handle and the pump assembly in the order of about 10-to-1. For greater flexibility and convenience during use, the handle assembly, including the power train disposed between the pump assembly and the handle, are mounted so as to be positionally adjusted in relation to the base of the hydraulic jack.

Abstract: The present invention relates to a hydraulic jack with a base plate on which are attached a pump cylinder, a jack cylinder, and a reservoir concentrically surrounding the jack cylinder, the reservoir being connected to the pump cylinder by means of a first passage, passing through the base plate, and a first nonreturn valve which enables hydraulic medium to flow from the reservoir on pumping, the pump cylinder being connected to the jack cylinder by means of a second passage, passing through the base plate, and a second nonreturn valve which enables hydraulic medium to flow from the pump cylinder on pumping, and the jack cylinder being connected to the reservoir by means of a relief passage and a blocking member including an adjustable bolt.